Equine Behavior Q & A: Just for Kicks

A few weeks ago, I took in a neglected and underfed horse. For the first few weeks she was really easygoing. Now that she’s getting her energy back, it seems that she’s starting to try to dominate me. At certain times—usually when I first turn her out—she lays her ears back, turns her behind to me and kicks at me. Also, when I pet her or brush her near her back, she swishes her tail and threatens to kick. She has severe club foot on her back right foot and will have to have surgery soon. I'm concerned, because after the surgery I will have to change the bandages on her back leg every day and I don't want to get kicked. I suspect that this behavioral change might be a sign of insecurity. Have you got any ideas or suggestions?
―Kari

First of all, thank you, Kari, for opening your heart to a horse in need. It does sound like a significant change in behavior. I have to wonder if she is in season. Some horses show significant behavior changes as they come into season. Read the rest of the answer...